You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I guide you?

USER: Owning to an emergency, I need to change my travelling dates in the past ticket which is booked in the last week. Can you please modify the ticket?

ASSISTANT: Sure, I will help you.

USER: Thank you for your response.

ASSISTANT: Please provide your name to check your reservation status.

USER: My name is Brenda Martinez.

ASSISTANT: Please wait a moment.

USER: Ok, take your own time.

ASSISTANT: Brenda, no reservation has been found on your name in our database.

USER: It's ok, thank you for checking my ticket status and providing the information regarding my ticket.

ASSISTANT: Thank you for choosing us.

USER: You are welcome.