You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Myself Daniel Robinson.

ASSISTANT: How may I help you?

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

ASSISTANT: Sure, I am here to help you with that. Let me check your reservation status in our records.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry to inform, no reservation is found on your name in our database.

USER: It's ok, no problem. Thank you for the information.

ASSISTANT: You are most welcome, Thank you Robinson for contacting us.