You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, May I know what kind of service you are looking for?

USER: Can you please help me in changing my recent reservation? As my planned trip has been postponed to some other dates.

ASSISTANT: Sure, I can help you in that.

USER: Thanks for that.

ASSISTANT: For that I need to know your name. Can you please provide me?

USER: Sure, my name is Richard Roberts.

ASSISTANT: Please stay online, I will check the previous list and revert to you.

USER: Sure, I'll wait for your response.

ASSISTANT: We are sorry to say that, there is no active reservation found on your name.

USER: Oh! May be I have done a wrong booking. Thank you anyways.

ASSISTANT: Thanks for approaching with us.