You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: Margaret Thompson here.

ASSISTANT: Nice to meet you, Margaret.

USER: I have to participate in Dragon Boat Festival at Houston, please book me a ticket from SEA to HOU.

ASSISTANT: Sure, may I know the travelling dates?

USER: Yes, that festival is in between 05/14 and 05/16.

ASSISTANT: Sorry Margaret, there are no flights found on your requirement.

USER: Oh! that's fine, I will go by some other way. Thank you for your service.

ASSISTANT: Thank you for approaching us, have a nice day. You are welcome.