You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Virginia Davis here.

ASSISTANT: Davis, how may I aid you?

USER: I would like to change my existing reservation due to some health issues, can you please help me in that?

ASSISTANT: Sure, please give me a moment to check your ticket status.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry, no reservation is available by your name.

USER: That's ok, no problem. Anyway thank you for the information.

ASSISTANT: Thank you for reaching us.