You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How exactly I can serve you the best today?

USER: My scheduled examination dates has been postponed, could you please help me with changing my recent reservation?

ASSISTANT: Sure, I can help you in that. May I know your good name please?

USER: My reservation was done under the name Joshua King.

ASSISTANT: Sure, To proceed further, I need to your new journey dates?

USER: I would like to depart on June 26th and return on June 28th.

ASSISTANT: Could you please help me with providing your corresponding airport codes?

USER: My source airport code is BOS and destination airport code is PHX.

ASSISTANT: Do you like to go with a economy class or business class?

USER: I need a connecting flight in economy class. And make sure that my airline is normal-cost.

ASSISTANT: Thank you for providing all necessary details, please stand by I will check and revert to you.

USER: Sure, take your time.

ASSISTANT: Thanks for waiting, there are no flights available at this moment matching your particulars.

USER: Ok, not an issue. Anyways, thank you for the information.

ASSISTANT: Thanks for connecting us, have a great day.