You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Patricia Walker.

ASSISTANT: How can I assist you today?

USER: Owing to an emergency case, I have to change my previous flight ticket booking. Can you please help me in that booking?

ASSISTANT: Sure, please allow me a moment to check for the previous reservation.

USER: Sure, take your own time.

ASSISTANT: Patricia Walker, there is no reservation found under your name.

USER: Not an issues with that one, thank you for your your information.

ASSISTANT: You are welcome. Thank you for contacting us.