You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I render you today?

USER: I want to change my journey date as my plan to visit Washington is postponed, can you help me with changing the reservation?

ASSISTANT: Sure, could you please provide your name to check your previous reservation status?

USER: Sure, I am Gregory Evans.

ASSISTANT: Ok, give me some time.

USER: Sure.

ASSISTANT: Thanks for waiting, we did not found any reservation by this name.

USER: Ok, no issues.

ASSISTANT: Thanks for consulting us.

USER: Thanks for your help.