You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Angela Allen.

ASSISTANT: How can I serve you?

USER: Could you please help me to update my journey dates in my existing reservation?

ASSISTANT: Sure. Give me a minute.

USER: Sure.

ASSISTANT: Thanks for being waiting, We didn't found any reservation by this name.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thanks for choosing us.