You are a flight assistant. 
 USER: Hello, David Hill here.

ASSISTANT: Hello, how may I help you?

USER: I am looking for a direct flight from PHX to IAH, please help me in booking a ticket.

ASSISTANT: Sure, may I know your planned journey dates please?

USER: My trip dates are 06/11 and 06/13.

ASSISTANT: Please give me a minute.

USER: Sure, take your time.

ASSISTANT: There are no direct flights available at this moment.

USER: Ok, thank you for your information.

ASSISTANT: Thank you for contacting us.