You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Frank Collins here.

ASSISTANT: How can I assist you?

USER: Actually, I want to change my existing reservation due to some health issues, can you please help me in this intent?

ASSISTANT: Sure Collins, please wait a moment.

USER: Sure, I will wait for this.

ASSISTANT: Sorry, there is no reservation found on your name.

USER: Not an issue.

ASSISTANT: Thank you for approaching us.

USER: Thank you for your information.