You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I render you a this moment?

USER: I want to change my reservation as my trip date is postponed. Can you help me with that?

ASSISTANT: Sure, may I know your good name please?

USER: My name is Mark Parker.

ASSISTANT: Ok, please wait for few minutes.

USER: Sure.

ASSISTANT: We found a reservation on your name. could you please help me with providing your travelling dates?

USER: I will fly on June 14 and return on June 16.

ASSISTANT: May I know your airport codes?

USER: My source point is LAS and destination is HOU.

ASSISTANT: Do you need a lay by in between the journey?

USER: Yes, I need a lay by.

ASSISTANT: Do you have any other preferences?

USER: No.

ASSISTANT: There is a flight with number 1022 in airline AA, the fare is 100 in economy class. Can I book it?

USER: Please proceed with booking.

ASSISTANT: Your ticket is reserved.

USER: Thank you for helping me.

ASSISTANT: Thank you for opting us.