You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Stephanie Jackson.

ASSISTANT:  Stephanie Jackson. How may I help you?

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

ASSISTANT: Sure, give me a moment, let me check the customer data base.

USER: Sure.

ASSISTANT: We have found your name in the date base. Can you provide us your new travel dates.

USER: I will travel on Dec 15 and return on Dec 17.

ASSISTANT: Let us know the airport codes.

USER: My source point is PHX and my destination is BOS.

ASSISTANT: Give me a moment.

USER: Sure, please book me a connecting flight.

ASSISTANT: JetBlue airlines with flight 1000 is providing service on your route.

USER: Please proceed with booking.

ASSISTANT: Your ticket is booked in the economy class with cost of 100 and single connection flight.

USER: Thank you for helping me.

ASSISTANT: Thank you for approaching us.