You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: I am Michelle Carter, in this vacation I would like to visit National Mall in IAD, so can you help me booking flight on 12/10?

ASSISTANT: Sure, I will help you with that.

USER: But make sure with 0 connection.

ASSISTANT: Can you please mention your boarding airport code and return date of your journey?

USER: I am going to return my source airport LAS on 12/12.

ASSISTANT:  Sure, I will check the flight with 0 connection only.

USER: Thank you.

ASSISTANT: Please hold on I will check.

USER: Ok, I will wait for your response.

ASSISTANT: Thanks for your patience. Sorry Michelle Carter, I cannot find any flight with your connection.

USER: Oh! Sad to hear, thank you for your services.

ASSISTANT: It's my pleasure, have a great day.