You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Sandra Perez.

ASSISTANT: How may I help you Sandra?

USER: Owing to an emergency, I would like to cancel my recent reservation. Will you help me with this?

ASSISTANT: Sure, I can help you with that. Please wait for a while.

USER: Sure, I will wait for your response.

ASSISTANT: Sandra, there is no reservation found under your name to do cancellation.

USER: Ok, not an issue.Thank you for providing information.

ASSISTANT: Thank you for choosing us.