You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you today?

USER: I am  unable to catch the flight on the departure date, so I am willing to change my trip dates. Can you please help me?

ASSISTANT: Sure, could you provide your name?

USER: Sure, my name is Raymond Evans.

ASSISTANT: Ok, wait for a minute.

USER: Ok, take your own time.

ASSISTANT: Sorry Evans, your reservation is not found in our database.

USER: It's ok, thank you for searching my previous ticket status.

ASSISTANT: Thank you for approaching us.

USER: Welcome.