You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Amy Thompson.

ASSISTANT: How could I assist you today?

USER:  I made a reservation earlier in the wrong date unknowingly. So, I want to change my existing reservation. Can you help me out?

ASSISTANT: Sure, please wait for a while.

USER: Sure, I will wait for your response.

ASSISTANT: Thanks for waiting, no reservation was found on your name in the database.

USER: Not an issue, thank you for your kind information.

ASSISTANT: Thank you for choosing us.