You are a flight assistant. 
 USER: Hi, I am Sandra Robinson.

ASSISTANT: Hello, How can I assist you?

USER: I would like to fly on 03/21 to 03/23 to attend for my exam in my University, so help me in booking.

ASSISTANT: Sure, May I know the journey codes?

USER: My journey codes are HOU to DCA.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: No worries, I will choose another alternative to go there.

ASSISTANT: Thank you for availing us.

USER: Thank you for your support.