You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I be at your service today?

USER: Can you please help me to book a flight from SFO to PHX?

ASSISTANT: Sure, I will help you in booking the ticket. May I know your travelling dates please?

USER: I want to depart on Apr 19 and need to return on Apr 21.

ASSISTANT: Do you have any other specifications?

USER: I am looking for a flight with single connection.

ASSISTANT: Please help me with your name for booking.

USER: Helen Hill here.

ASSISTANT: Sorry for this inconvenience, I could not find any flight with your requirements.

USER: Ok, not an issue.

ASSISTANT: Thank you for reaching us.

USER: Thank you for checking.