You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may i help you?

USER: Christine Thompson here.

ASSISTANT: Yes, Christine.

USER: I want to change my existing reservation, due to some health issue. Can you please help me?

ASSISTANT: Sure, please let me check your reservation status.

USER: Ok, take your time.

ASSISTANT: There is no reservation found under your name in our database.

USER: It's ok, thank you for your information.

ASSISTANT: Thank you for reaching us.

USER: Welcome.