You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am John Williams.

ASSISTANT: How may I help you?

USER: As my meeting got postponed at Dallas, can you please help me in changing my existing reservation?

ASSISTANT: I found a reservation with your details, can you please help me with your travel dates?

USER: Sure, my preferable journey dates are from 05/28 to 05/30.

ASSISTANT: May I know your travel codes?

USER: My nearest airport codes of journey are from MSP to CLT.

ASSISTANT: According to your information, I have found a flight with single stop over in your journey with a minimum fare of 100 with flight number 1014. Shall I proceed with this flight?

USER: Please reserve my ticket with this airlines.

ASSISTANT: Your booking is done.

USER: Thank you for booking my ticket.

ASSISTANT: Most welcome.