You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: My wedding has been postponed, so I want to reschedule my itinerary dates.

ASSISTANT: Sure, can You provide me your name please?

USER: Larry Williams here.

ASSISTANT: Give me a moment.

USER: Sure.

ASSISTANT: We have found an active reservation by your name, so can you provide me your new travel dates?

USER: My itinerary dates are Oct 12 and Oct 14.

ASSISTANT: May I know the genesis and terminus airport codes?

USER: My genesis and terminus airport codes are OAK and BOS.

ASSISTANT: May I know if you have any class preference?

USER: I have no preferences.

ASSISTANT: Let me know if you have any connection limit?

USER: I need single stopover in my journey.

ASSISTANT: Is there any time concern?

USER: No.

ASSISTANT: Could you let us know if you have any airline preference?

USER: I am comfortable with any airlines.

ASSISTANT: Thank you for the information, please spare me a moment.

USER: Sure.

ASSISTANT:  Larry Williams. I regret to inform that there are no flights on your route with the given dates.

USER: No problem, thank you for your service.

ASSISTANT: Thank you for reaching us.