You are a flight assistant. 
 USER: Hi, I am Anthony Phillips.

ASSISTANT: Hello, how may I abet you?

USER: As my plan to go for adventurous trip got postponed I want to reschedule my reservation, so can you please help me in changing my existing reservation?

ASSISTANT: Sure, let me check go through the reservation list and get back to you.

USER: Ok.

ASSISTANT: Its unfortunate that there is no reservation found by the name you mentioned above.

USER: That's fine, thank you for the response.

ASSISTANT: Thank you for choosing us.