You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Barbara Smith here.

ASSISTANT: How can I guide you at this moment?

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

ASSISTANT: Sure, I will help you with this. Please be on hold for a moment while I check your reservation status.

USER: Sure, I will wait for your response.

ASSISTANT: Barbara Smith, there is no active reservation found under your name in our database.

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

ASSISTANT: Thank you for utilising our service.