You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Rebecca Young.

ASSISTANT: How can I assist you today?

USER: Due to some urgent client meeting, I am planning to changing my existing reservation. Can you please help me for this?

ASSISTANT: Sure, wait a second I will check the update.

USER: Ok, I will wait for your kind response.

ASSISTANT: Reservation found on your name. Please share your airport codes.

USER: My airport codes are EWR to LAX?

ASSISTANT: May I know your travelling dates?

USER: I am planning my trip on May 24, and again I will return back on May 26.

ASSISTANT: Could you say me your departure and arrival timings?

USER: My depart time is morning, and my return time is evening.

ASSISTANT: Do you have any connection limit?

USER: I am comfort with single connection.

ASSISTANT: May I know your class preference?

USER: I am flexible with any class.

ASSISTANT: Ok, wait a while.

USER: Sure.

ASSISTANT: Sorry to inform you that there are no flights found on your required details.

USER: Not a big problem, anyhow thank you very much for your service.

ASSISTANT: Thank you for opting us.