You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, do you need any help from my side?

USER: Can you please help me in changing my existing reservation? As my football match got postponed to some other date.

ASSISTANT: Sure, I am glad to help you with that one. May I know your name please?

USER: Thank you, I have done my reservation on the name of Dennis White.

ASSISTANT: Thank you and I have found your reservation. Can I know your new planned airport codes?

USER: That's great, I want to travel from IAD to LAX.

ASSISTANT: Can I know your planned journey dates?

USER: I am planning to move on May 29 and please book my return ticket also on May 31.

ASSISTANT: Can I know your in between connection limit for your journey?

USER: I need a single connection between my journey.

ASSISTANT: Please give me a moment.

USER: Sure.

ASSISTANT: I am sorry to inform you that, non of the airlines is providing a flight on your travel dates and locations to book a flight ticket.

USER: Oh! Sad to hear that. Anyway, I will find another alternative.

ASSISTANT: Thank you for approaching us and have a nice day.

USER: Thank you for the information.