You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I am Linda Allen. I want to book a direct flight ticket to attend any emergency case. Can you help me?

ASSISTANT: Sure, I am here to help you. May I know your travelling dates please?

USER: 11/22 and 11/24 are my travelling dates.

ASSISTANT: Ok, please help me with your journey codes.

USER: DCA  and PHX are my preferable airport codes.

ASSISTANT: Wait a minute please.

USER: Ok.

ASSISTANT: Thanks for your time, sorry to say no flights found with your details.

USER: No issue.

ASSISTANT: Thank you for reaching us,have a nice day.

USER: Thank you.