You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you today?

USER: I want to change my existing reservation owing to an emergency.

ASSISTANT: Sure, can you provide your name for checking the reservation status?

USER: My name is Ruth Walker.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: Thanks for waiting. We hardly tried to find your reservation but, no reservation has been found with your name.

USER: Thank you.

ASSISTANT: Thank you for reaching us.