You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: James White here.

ASSISTANT: How can I assist you today?

USER: I want to attend my son's convocation ceremony, please book my ticket from SEA to IAH.

ASSISTANT: Sure, will you mention your travelling dates please?

USER: My itinerary dates are 08/08 and 08/10.

ASSISTANT: Please give me a moment.

USER: Sure.

ASSISTANT: Thanks for waiting, there is no flights available under your requested details.

USER: No problem, thank you.

ASSISTANT: Welcome, have a great day.