You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Helen Martin here.

ASSISTANT: How can I assist you at this moment?

USER: Can you please help me in changing my recent reservation? As my health condition is not well.

ASSISTANT: Sure, I will help you with this. Helen Martin, there is no active reservation found under your name in our database.

USER: Oh! May be I did a wrong booking.

ASSISTANT: Thank you for contacting us.

USER: Thank you anyways.