You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Samantha Hall.

ASSISTANT: How may I render you at this moment?

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

ASSISTANT: Sure, please wait for few minutes.

USER: Sure.

ASSISTANT: There is no existing reservation found on your name in our data base.

USER: That's Ok, thanks for your response.

ASSISTANT: Thank you for reaching us.