You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you?

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, may I know your name please?

USER: Sure, Patrick Hernandez is my name.

ASSISTANT: Please be on hold.

USER: Sure.

ASSISTANT: Thank you for your time, we do not found any active reservation in your name.

USER: Ok, thanks for your information.

ASSISTANT: Thank you for reaching us.