You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Andrew Davis here.

ASSISTANT: How can I guide you at this moment?

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 will help you in changing your reservation. Please give me a moment to check your reservation status.

USER: Sure, take your own time.

ASSISTANT: Andrew Davis, I have searched the database with your name and I couldn't find any active reservation with your details.

USER: Oh! That's ok, may be I have done a wrong booking. Thank you anyways.

ASSISTANT: Thank you for utilising our service.