You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I want to change my existing reservation due to bad health issues. Can you help me with that?

ASSISTANT: Sure, I will help you for this.

USER: Thank you.

ASSISTANT: For changing the reservation. May I know your name please?

USER: Sure, I am Deborah Smith.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Sorry to intimate you, no reservation is found with your criteria.

USER: Ok, no issues.

ASSISTANT: Thank you very much for contacting our agency.

USER: Thank you for your response.

ASSISTANT: You are most welcome.