You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello. How may I help you now?

USER: Can you please help me in changing my existing reservation, as my exam got postponed.

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: Can I know your name to change your previous reservation?

USER: My name is Brenda Perez.

ASSISTANT: Please wait a moment.

USER: Ok.

ASSISTANT: I have found your reservation. Can you please provide your new journey dates?

USER: My new trip dates are Jan 30 to Feb 01.

ASSISTANT: Ok, can you please provide your origin and destination airport codes for booking?

USER: My airport codes are DTW to ORD.

ASSISTANT: Do you have any connection limit?

USER: I prefer a connecting flight.

ASSISTANT: Do you have any more specifications?

USER: I am looking for big brand airlines.

ASSISTANT: Please wait a moment to check the flights.

USER: Ok.

ASSISTANT: I have found a flight with single connection between your journey having with the fare of 100 provided by Hawaiian airlines in economy class. Are you ok with this flight?

USER: Ok, please go ahead.

ASSISTANT: Ok, your reservation has been successfully changed.

USER: Thank you for your service.

ASSISTANT: Thank you for approaching us, have a great journey.