You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello,.

USER: I am Emily Clark.

ASSISTANT: Clark, How can I help you?

USER: I want to book a flight ticket from MA-BOS to CA-LAX. Can you help me?

ASSISTANT: Sure, I will help you in that.

USER: Thank you.

ASSISTANT: Can you help me with your scheduled travelling dates?

USER: 12/29 and 12/31 are my travelling dates.

ASSISTANT: Thanks for the details, please wait.

USER: Ok.

ASSISTANT: Thanks for your time. Sorry Clark, Unfortunately there are no flights found on your routes of journey in your specified dates.

USER: No issue. Thank you for the information.

ASSISTANT: Thanks for choosing us.