You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Samantha Clark here. I want to attend a workshop on yoga, so please book my ticket from LAX to DCA.

ASSISTANT: Samantha Clark, I am here to help you for this. When would you like to travel?

USER: My itinerary dates are Jan 11 and Jan 13.

ASSISTANT: Do you have any airline preference?

USER: No.

ASSISTANT: Do you have any other specifications?

USER: No.

ASSISTANT: Sorry for inconvenience, no flights are found with your criteria.

USER: No problem, thank you.

ASSISTANT: Thank you very much for reaching us.