You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I provide assistance to you?

USER: I am Nancy Lopez. Owing to an emergency I want to change my existing reservation, can you please help me with that?

ASSISTANT: Sure. Please wait for a while, I will check your reservation. Thank you for being patience, there is no reservation found on your name.

USER: Ok, no issues. Thanks for your service.

ASSISTANT: Thank you for reaching us.