You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I would like to celebrate my birthday at Seattle, please help me in booking a ticket from IAH to SEA.

ASSISTANT: Sure, can you share me your itinerary dates?

USER: My planned journey dates are on Apr 23 and Apr 25.

ASSISTANT: Do you need any break in your journey?

USER: I need a connecting flight for my journey.

ASSISTANT: May I know your depart time and arrival time?

USER: I would like to depart in the afternoon.

ASSISTANT: Do you have any other preferences?

USER: No more preferences. Please find the availability of flights.

ASSISTANT: May I know your good name please?

USER: My name is Nancy Wilson.

ASSISTANT: Sorry to inform you that, there are no flights available with your requirements.

USER: Ok, no problem. Thank you for your information.

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