You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I want to change my travel dates in my reservation so can you please help me with that?

ASSISTANT: Sure, can you please let me know your name to check with the reservation status?

USER: Thank you for your response, my name is Sarah Miller.

ASSISTANT: Sorry, there is no active reservation found under your name to change.

USER: Oh! It's ok, no problem. Thank you for your information.

ASSISTANT: Thank you for reaching us!.